Question
Let $A=\{1,2,3\}$ and $B=\{4,5\}$Then find the total number of one-one function between two sets $A$ and $B$.
Step 1
A function $f: A \rightarrow B$ is said to be one-to-one (or injective), if the images of distinct elements of $A$ under $f$ are distinct, i.e., for every $a_1, a_2 \in A$, if $a_1 \neq a_2$, then $f(a_1) \neq f(a_2)$. Show more…
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